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 ###Instrução: Nomeie o menor intervalo entre as doses para a idade mínima de 1ª dose aos 6 semanas de idade para a vacina contra difteria-coqueluche-tétano?
 ###Tabelas: CREATE TABLE ministry_of_higher_education (ministry_of_higher_education_id AUTO_INCREMENT PRIMARY KEY, Name in English VARCHAR, Name in Malay VARCHAR, Acronym VARCHAR, Foundation VARCHAR, Location VARCHAR) CREATE TABLE boys (boys_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Sport VARCHAR, Tournament Structure VARCHAR, # of Divisions INT, 1st Tournament INT, 2012-2013 State Tournament Location VARCHAR) CREATE TABLE routine_immunization_schedule_for_infants (routine_immunization_schedule_for_infants_id AUTO_INCREMENT PRIMARY KEY, Vaccine VARCHAR, Minimum Age at 1st Dose VARCHAR, Number of Doses VARCHAR, Dose VARCHAR, Minimum Interval Between Doses VARCHAR, Route VARCHAR) CREATE TABLE winners_of_the_virginia_derby_since_1998 (winners_of_the_virginia_derby_since_1998_id AUTO_INCREMENT PRIMARY KEY, Year INT, Winner VARCHAR, Jockey VARCHAR, Trainer VARCHAR, Owner VARCHAR, Distance (Miles) VARCHAR, Time VARCHAR) CREATE TABLE defunct_teams (defunct_teams_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Sport VARCHAR, League VARCHAR, Venue VARCHAR, Championships INT, Years Active VARCHAR)  
SELECT Minimum Interval Between Doses FROM routine_immunization_schedule_for_infants WHERE Minimum Age at 1st Dose = 6 weeks old AND Vaccine = diphtheria-pertussis-tetanus vaccine